TD04 External Waste Gate Kit by GMC Racing

Stainless Steel Turbo Manifold with External Wastegate

This stainless steel turbo manifold is designed specifically for 1.4 T-Jet engines and supports Abarth, Fiat, Alfa Romeo, and Lancia applications. Featuring a external wastegate mounting, this manifold replaces the factory unit without requiring structural modifications, making it an ideal upgrade for high-performance builds.

Manufactured entirely from 1.5mm thick 304 stainless steel, the manifold offers an exceptional balance of strength, heat resistance, and reduced weight. As a result, it delivers improved exhaust gas flow, increased reliability, and noticeable power gains under demanding conditions.

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Motorsport-Inspired Design

Developed using over a decade of motorsport experience, this manifold focuses on maximising exhaust flow efficiency. Therefore, it reduces back pressure while allowing the turbocharger to operate more effectively.

Thanks to precision engineering and extensive real-world testing, this design supports higher boost levels and sustained performance, making it suitable for both fast-road and competition use.

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4-in-1 Equal Flow System

The advanced 4-in-1 collector design ensures exhaust gas flows remain parallel rather than conflicting. Consequently, this layout significantly reduces back pressure and operating temperatures.

This proven configuration delivers:

• Faster turbo spool

• Improved thermal control

• Power gains typically in the 10–15 BHP range

Furthermore, the 4-in-1 section is machined from solid material, eliminating joints that can disrupt airflow or compromise durability.

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Precision Welding & Construction Quality

Each manifold benefits from expert TIG welding, carried out by skilled specialists with close attention to detail. As a result, welds remain clean, smooth, and free from internal obstructions.

This superior weld quality:

• Improves exhaust gas velocity

• Eliminates turbulence

• Enhances long-term reliability

• Maintains a flawless internal and external finish

In addition, all flanges are made from solid stainless steel on both the cylinder head and turbine sides, ensuring maximum strength and resistance to thermal stress.

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External Wastegate & EGT Sensor Provision

This manifold includes:

• External wastegate compatibility

• Integrated EGT temperature probe port, with selectable thread options

Therefore, it supports accurate exhaust temperature monitoring and advanced engine tuning.

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Installation Requirements

To install this manifold correctly, the following must be considered:

• ECU remapping is required

• Fuel system upgrades (injectors) may be necessary

• Replacement of the water sleeve seal is required

Genuine Fiat water sleeve seal part number:
0055185066 – 001

For best results, this manifold is recommended as part of a complete turbo upgrade package.

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What’s Included

• Stainless steel turbo manifold

• Stainless steel downpipe kit

• Uniball brackets and mounting fittings

• Assembly instructions

• GMC Racing branded accessories

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Important Notice

This product is intended exclusively for motorsport or off-road use where power levels exceed road-legal limits. GMC Racing accepts no responsibility for use outside local regulations.

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Why Choose This Manifold?

• High-flow 4-in-1 design for maximum efficiency

• Lightweight 304 stainless steel construction

• Tial external waste gate compatibility

• Reduced back pressure and operating temperatures

• Proven power gains and motorsport durability

Upgrade your 1.4 T-Jet engine with a precision-engineered stainless steel turbo manifold designed for serious performance and long-term reliability.